Die head



March 19, 929. A. F. BREITENSTEIN ,706,

DIE HEAD Filed May 12, 1926 Patented Mar. 19, 1929.

PATENT OFFICE.

UNITED STATES ALBERT F. BREITENSTEIN, OF NEW HAVEN, CONNECTICUT, ASSIGNOR TO THE GEO- METBIC TOOL 60., OF HAVEN, CONNECTICUT, A CORPORATION.

DIE HEAD.

Application filed May 12,

Fig. 1 is a view mainly in side elevation and partly in longitudinal section ofa die-head embodying my invention.

Fig. 2 is a plan view thereof with a part of the operating-sleeve-broken away.

Fig. 3 is a view thereof mainlyin front elevation and partly in vertical section.

Fig. 1 is a detached view in inside elevation of one of the chasers.

Fig. 5 is a similar view in side elevation of one of the chasers.

Fig. 6 is a detached view in side elevation of one of the chaser-retaining dogs.

Fig. 7 is a detached planview on an enlarged scale of one of the dog-carrying bars. Fig. 8 is an end view thereof.

My invention relates to an improvement in die-heads of that class having radially-movable ohasers forced inwardly into their cut ting positions by an operating-member which has chaser-operating, chaser-retracted, and chaser-clearance positions, the object being to produce a simple, convenient and effective tool constructed with particular reference to yieldingly holding the chasers in the tool when the said operating-member is moved into its chaser-clearance position, in which the chasers are inserted into and removed from the fixture.

With these ends in view, my invention consists in a die-head having chasers, an operating-member therefor, and spring-actuated v dogs co-acting with the chasers for yieldingly retaining them in the die-head when the said operating-member is moved into its chaser clearance position.

My invention further consists in a'die-head characterized as above and having means for yieldingly retaining the chasers in the diehead when the said operating-member is moved into its chaser-clearance position, the

said means including radially-movable dogs co-acting directly with the chasers, thrustbars carrying the said dogs, and a pair of springs for each thrust-bar.

My invention further consists in a die-head having certain details of construction and combinations of parts as will be hereinafter described andcparticularly pointed out in the claims.

In carrying out my invention, as herein shown, it is embodied in a die-head of standard construction having a skeleton-body 10 provided with a shank 11 by means of which 1926. Serial No. 108,491.

the die-head is mounted for use. The said body mounts a chaser-operating member in the form of a sliding operating-sleeve 12 adjust-ed in its position for varying the cutting diameter of the die-head in the ordinary manner by means of an adjusting-nut 13 threaded upon the shank 11, the said sleeve having a forward or operating position, an intermediate or chaser-retracted position, and a rear or chaser-clearance position.

The said body 10 is provided at its forward end with four equidistant radial slots 14.- respectively receiving one of four corresponding chaser-s15, each of which is provided with cutting-teetl1 16 at its inner end, and a bevel 17 at its outer end for co-action wit-h a camsurface 18 formed by notching the inner edge of the forward end of the sleeve 12.

To provide for the radial retraction of the chasers 15 into their retired or non-cutting positions and for their yielding retention in the die-head when the sleeve 12 thereof is moved into its chaser-clearance position, each chaser is formed in its rear edge with an outwardly-and-forwardly-inclined notch 19 which receives a correspondingly-inclined forwardly-projecting tooth 20 formed upon the lower end of each of four retaining-dogs 21 having bodily radial movement in a corresponding number of equidistant sockets 22 formed in the die-body 10, each of which sockets is connected with one of the chaserslots 14L therein by a radial passage 33. Each of the said dogs 21 is rigidly and cent-rally mounted upon a transversely-arranged radially-movable thrust-bar 23 extending at its opposite ends into a pair of radial springpockets 24 respectively receiving helical actuating-springs 25 upon the outer ends of which the flat inner dog-positioning faces 26 of the ends of the bars rest and which constantly exert an effort to push the bars outward and hence the dogs 21, by which this urge is transmitted to the chaser 15, the tooth 20 of which is normally engaged with the correspondingly-inclined tooth 27 formed by the notch 19. The said springs also act to yieldingly hold the tooth 20 of the dog 21 in the notch 19 of its complementary chaser. Each chaser is thus provided with a pair of springs for its retraction into its retired position. The said teeth 27 are opposed by downwardly-inclined bevels 28 which co-act, as will be later described, with the slightly-rounded outer ing position,"as shown by full lines in Figs. 1

and 2, it'will engage with the beveled outer ends of the chasers and hold them in the diehead. So, too, when the sleeve 18 is in its chaser-retracted or intermediate position, as indicated by the broken lines 29, it still remains in engagement with the outer end of the chasers and serves to retain them in the die-head. \Vhen, however, the sleeve is moved into its chaser-clearance position, as indicated by the broken lines 30 in Fig. 1, it is entirely cleared from the chasers which would then be free to fall out of the die-head, save for the presence of the dogs 21, the teeth of which are normally projected into the notches 19 of the chasers and which are themselves prevented from falling out of the die-head by the forward end of the sleeve 12.

y In case it should be desired to withdraw the chasers from the die-head for any reason, they are manually gripped by their outer ends and drawn radially outward, whereby the camsurfaces 28 of their notches 19 are'brought into engagement with the rounded outer edges of the teeth 20 of the dogs 21, which are normally held'in their tilted positions, as shown by Fig. 1, by the impingement of the outer ends of the springs upon the flat inner faces 26 of the thrust-bars 23 upon which the dogs are fixed at an angle with respect to the said faces, so that normally the dogs are maintained in the tilted positions required for the projection of their teeth 20 into the notches 19 of the chasers and the consequent retention of the same in the die-head when l the operating-sleeve 12 is in its chaser-clearance position. The surfaces 28 having been thus engaged with the teeth 20 of the dogs 21, the said dogs are rocked inwardly with the effect of clearing their said teeth from the chasers, which are thus freed of restraint.

teeth of the dogs will be snapped into their notches 19.

It will be seen that by virtue of my, invention,-I provide against the escape of any of the chasers from the die-head when the operating-sleeve thereof is moved into itschaserclearance position, while, on the other hand, it is a matter of great convenience in assembling the chasers in the die-head, before the engagement of the operating sleeve therewith, to have them automatically engaged and held in place one by one, since otherwise the four, of them must be manually held in place concurrently while the sleeve is being moved over them.

A device for yieldingly retaining the chasers in the die-head is not broadly claimed herein but is made the subject-matter of a copending application, Serial No. 107,645, filed May 8, 1926, by Ewald'A. Bar'teit.

I claim: i v

1. A die-head, having radially-movable chasers; a'chaser-operating member having chaser-closing, chaser-retracted, and chaserclearance positions; combined chaser-retracting and chaser-retainingdogs having radial bodily movement and rocking movement; spring means for urging the said dogs bodily outward and rocking them toward their respective chasers; and inter-engaging means extending between the chasers and dogs for positively retracting the chasers and yieldingly retaining them in place when the chaser-operating member is in its chaser-r the said chasers and yieldinglyretain them in place when the chaser-operating member is in its chaser-clearance position.-

3. A die-head, having a plurality of radially-movable chasers each formed with a coupling notch; a chaser operating member having chaser-closing, chaser-retracted, and

. chaser-clearance ositions' a combined chaser-retracting and chaser-retaining dog for each chaser having radial bodily movement and rocking movement and provided with a tooth adapted to enter the said couplingnotch of its complementary chaser; spring means for urging each of the said dogs bodily outward and rocking the same toiyieldingly holdthe tooth thereof in the notch of its respective chaser; whereby the said chasers are positively retracted and yieldingly retained in place when the chaser-operatingmember is in its chaser-clearance position.

4:. A, die-head, having a plurality of radially movable chasers each formed uponits inner face with an outwardly and forwardlyinclined coupling-notch; a chaser-operating member having chaser-closing, chaser-retracted, and chaser-clearance positions; a combined chaser-retracting and chaser-retaining dog for each chaser having radial bodily movement and rocking movement and formed wit-h a tooth adapted to enter the said notch of its complementary chaser; spring means for urging each of the said dogs bodily outward and rocking the same to yieldingly hold the tooth thereof in the said inclined notch of its respective chaser; whereby the said chasers are positively retracted and yieldingly retained in place when the chaser operating member is in its chaser-clearance position.

5. A die-head, having a plurality of radially-movable chasers each provided upon its inner face with a coupling-notch having its inner wall inclined forwardly and outwardly to form a cam-surface; a chaser-operating member having chaser-closing, chaserretracted, and chaser-clearance positions; a combined chaser-retracting and chaser-retaining dog for each of said chasers having radial bodily movement and rocking movement and formed with a tooth adapted to enter the said coupling-notch of its complementary chaser; spring means for urging each of the dogs bodily outward and rocking the same to yieldingly hold the tooth thereof in the notch of its respective chaser and in the path of movement of the said cam surface; whereby the said chasers are positively retracted and yieldingly retained in place when the chaser-operating member is in its chaserclearance position.

6. A die-head having a plurality of chasers each formed with an inclined coupling-notch and with reversely-inclined cam-surfaces, and a radially-movable spring-actuated pivotal dog for each chaser provided with a tooth co-acting with the said notch of its complementary chaser for the retraction of the chasers from the work and with one of the said cam-surfaces when the chaser is withdrawn and with the other of the said cam-surfaces when the chaser is inserted, whereby the dog is rocked into its retired clearance position with respect to the chaser.

7. A die-head having chasers, an operating-member therefor radially-movable spring-actuated dogs co-acting directly with the chasers for the retraction thereof from the work, rocking thrust-bars upon which the dogs are mounted and springs co-acting with the opposite ends of the thrust-bars and operating to retract the chasers through the said bars and dogs.

8. A die-head having chasers, an operating-member therefor, radially-movable spring-actuated dogs co-acting directly with the chasers for the retraction thereof from the work, rocking thrustbars upon which the dogs are mounted, and springs co-acting with the opposite ends of the thrust-bars and operating to retract the chasers through the said bars and dogs, the spring-engaging faces of the said thrust-bars being provided with dogpositioning surfaces with which the springs engage.

9. A die-head having chasers, an operating-sleeve therefor, radially-movable dogs 00- acting directly with the chasers for the retraC- tion thereof from the work, transversely-arranged rocking thrust-bars provided at their ends with dogpositioning faces and having the said dogs mounted upon them with predetermined relation to such faces, and springs engaging the dog-positioning faces of the thrust-bars, whereby the urge of the springs is transmitted to the chasers through the said bars and dogs.

In testimony whereof, I have signed this specification.

ALBERT F. BREITENSTEIN. 

